forked from Minki/linux
fea2099597
When there is no device to attach to the IOMMU domain, as may be the
case when the device-tree does not contain the proper iommu node, it is
best to keep going without IOMMU support rather than failing.
This allows the driver to probe and function instead of taking down
all of the tegra drm driver, leading to missing display support.
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Fixes: 404bfb78da ("gpu: host1x: Add IOMMU support")
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170710193305.5987-1-contact@paulk.fr
328 lines
7.6 KiB
C
328 lines
7.6 KiB
C
/*
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* Tegra host1x driver
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*
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* Copyright (c) 2010-2013, NVIDIA Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/host1x.h>
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#undef CREATE_TRACE_POINTS
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#include "bus.h"
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#include "channel.h"
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#include "debug.h"
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#include "dev.h"
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#include "intr.h"
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#include "hw/host1x01.h"
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#include "hw/host1x02.h"
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#include "hw/host1x04.h"
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#include "hw/host1x05.h"
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void host1x_sync_writel(struct host1x *host1x, u32 v, u32 r)
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{
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void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
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writel(v, sync_regs + r);
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}
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u32 host1x_sync_readl(struct host1x *host1x, u32 r)
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{
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void __iomem *sync_regs = host1x->regs + host1x->info->sync_offset;
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return readl(sync_regs + r);
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}
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void host1x_ch_writel(struct host1x_channel *ch, u32 v, u32 r)
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{
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writel(v, ch->regs + r);
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}
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u32 host1x_ch_readl(struct host1x_channel *ch, u32 r)
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{
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return readl(ch->regs + r);
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}
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static const struct host1x_info host1x01_info = {
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.nb_channels = 8,
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.nb_pts = 32,
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.nb_mlocks = 16,
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.nb_bases = 8,
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.init = host1x01_init,
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.sync_offset = 0x3000,
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.dma_mask = DMA_BIT_MASK(32),
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};
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static const struct host1x_info host1x02_info = {
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.nb_channels = 9,
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.nb_pts = 32,
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.nb_mlocks = 16,
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.nb_bases = 12,
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.init = host1x02_init,
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.sync_offset = 0x3000,
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.dma_mask = DMA_BIT_MASK(32),
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};
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static const struct host1x_info host1x04_info = {
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.nb_channels = 12,
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.nb_pts = 192,
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.nb_mlocks = 16,
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.nb_bases = 64,
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.init = host1x04_init,
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.sync_offset = 0x2100,
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.dma_mask = DMA_BIT_MASK(34),
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};
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static const struct host1x_info host1x05_info = {
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.nb_channels = 14,
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.nb_pts = 192,
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.nb_mlocks = 16,
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.nb_bases = 64,
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.init = host1x05_init,
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.sync_offset = 0x2100,
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.dma_mask = DMA_BIT_MASK(34),
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};
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static const struct of_device_id host1x_of_match[] = {
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{ .compatible = "nvidia,tegra210-host1x", .data = &host1x05_info, },
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{ .compatible = "nvidia,tegra124-host1x", .data = &host1x04_info, },
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{ .compatible = "nvidia,tegra114-host1x", .data = &host1x02_info, },
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{ .compatible = "nvidia,tegra30-host1x", .data = &host1x01_info, },
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{ .compatible = "nvidia,tegra20-host1x", .data = &host1x01_info, },
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{ },
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};
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MODULE_DEVICE_TABLE(of, host1x_of_match);
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static int host1x_probe(struct platform_device *pdev)
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{
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const struct of_device_id *id;
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struct host1x *host;
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struct resource *regs;
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int syncpt_irq;
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int err;
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id = of_match_device(host1x_of_match, &pdev->dev);
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if (!id)
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return -EINVAL;
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regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!regs) {
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dev_err(&pdev->dev, "failed to get registers\n");
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return -ENXIO;
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}
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syncpt_irq = platform_get_irq(pdev, 0);
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if (syncpt_irq < 0) {
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dev_err(&pdev->dev, "failed to get IRQ\n");
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return -ENXIO;
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}
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host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
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if (!host)
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return -ENOMEM;
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mutex_init(&host->devices_lock);
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INIT_LIST_HEAD(&host->devices);
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INIT_LIST_HEAD(&host->list);
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host->dev = &pdev->dev;
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host->info = id->data;
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/* set common host1x device data */
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platform_set_drvdata(pdev, host);
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host->regs = devm_ioremap_resource(&pdev->dev, regs);
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if (IS_ERR(host->regs))
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return PTR_ERR(host->regs);
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dma_set_mask_and_coherent(host->dev, host->info->dma_mask);
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if (host->info->init) {
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err = host->info->init(host);
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if (err)
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return err;
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}
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host->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(host->clk)) {
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dev_err(&pdev->dev, "failed to get clock\n");
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err = PTR_ERR(host->clk);
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return err;
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}
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host->rst = devm_reset_control_get(&pdev->dev, "host1x");
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if (IS_ERR(host->rst)) {
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err = PTR_ERR(host->rst);
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dev_err(&pdev->dev, "failed to get reset: %d\n", err);
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return err;
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}
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if (iommu_present(&platform_bus_type)) {
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struct iommu_domain_geometry *geometry;
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unsigned long order;
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host->domain = iommu_domain_alloc(&platform_bus_type);
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if (!host->domain)
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return -ENOMEM;
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err = iommu_attach_device(host->domain, &pdev->dev);
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if (err == -ENODEV) {
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iommu_domain_free(host->domain);
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host->domain = NULL;
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goto skip_iommu;
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} else if (err) {
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goto fail_free_domain;
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}
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geometry = &host->domain->geometry;
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order = __ffs(host->domain->pgsize_bitmap);
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init_iova_domain(&host->iova, 1UL << order,
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geometry->aperture_start >> order,
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geometry->aperture_end >> order);
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host->iova_end = geometry->aperture_end;
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}
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skip_iommu:
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err = host1x_channel_list_init(&host->channel_list,
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host->info->nb_channels);
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if (err) {
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dev_err(&pdev->dev, "failed to initialize channel list\n");
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goto fail_detach_device;
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}
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err = clk_prepare_enable(host->clk);
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if (err < 0) {
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dev_err(&pdev->dev, "failed to enable clock\n");
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goto fail_free_channels;
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}
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err = reset_control_deassert(host->rst);
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if (err < 0) {
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dev_err(&pdev->dev, "failed to deassert reset: %d\n", err);
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goto fail_unprepare_disable;
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}
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err = host1x_syncpt_init(host);
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if (err) {
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dev_err(&pdev->dev, "failed to initialize syncpts\n");
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goto fail_reset_assert;
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}
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err = host1x_intr_init(host, syncpt_irq);
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if (err) {
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dev_err(&pdev->dev, "failed to initialize interrupts\n");
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goto fail_deinit_syncpt;
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}
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host1x_debug_init(host);
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err = host1x_register(host);
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if (err < 0)
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goto fail_deinit_intr;
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return 0;
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fail_deinit_intr:
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host1x_intr_deinit(host);
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fail_deinit_syncpt:
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host1x_syncpt_deinit(host);
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fail_reset_assert:
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reset_control_assert(host->rst);
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fail_unprepare_disable:
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clk_disable_unprepare(host->clk);
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fail_free_channels:
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host1x_channel_list_free(&host->channel_list);
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fail_detach_device:
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if (host->domain) {
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put_iova_domain(&host->iova);
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iommu_detach_device(host->domain, &pdev->dev);
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}
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fail_free_domain:
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if (host->domain)
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iommu_domain_free(host->domain);
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return err;
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}
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static int host1x_remove(struct platform_device *pdev)
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{
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struct host1x *host = platform_get_drvdata(pdev);
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host1x_unregister(host);
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host1x_intr_deinit(host);
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host1x_syncpt_deinit(host);
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reset_control_assert(host->rst);
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clk_disable_unprepare(host->clk);
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if (host->domain) {
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put_iova_domain(&host->iova);
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iommu_detach_device(host->domain, &pdev->dev);
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iommu_domain_free(host->domain);
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}
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return 0;
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}
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static struct platform_driver tegra_host1x_driver = {
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.driver = {
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.name = "tegra-host1x",
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.of_match_table = host1x_of_match,
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},
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.probe = host1x_probe,
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.remove = host1x_remove,
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};
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static struct platform_driver * const drivers[] = {
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&tegra_host1x_driver,
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&tegra_mipi_driver,
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};
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static int __init tegra_host1x_init(void)
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{
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int err;
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err = bus_register(&host1x_bus_type);
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if (err < 0)
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return err;
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err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
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if (err < 0)
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bus_unregister(&host1x_bus_type);
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return err;
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}
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module_init(tegra_host1x_init);
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static void __exit tegra_host1x_exit(void)
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{
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platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
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bus_unregister(&host1x_bus_type);
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}
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module_exit(tegra_host1x_exit);
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MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
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MODULE_AUTHOR("Terje Bergstrom <tbergstrom@nvidia.com>");
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MODULE_DESCRIPTION("Host1x driver for Tegra products");
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MODULE_LICENSE("GPL");
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